Hubbard model and fullerenes: Stability of the Nagaoka state

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.1315· OSTI ID:6691767

de Souza, A M.C. ^[1]

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1. Centro Brasileiro de Pesquisas Fisicas, Conselho Nacional de Desenvolvimento Cientifico e Technologico Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro (Brazil)

We prove numerically that the saturated ferromagnetic state in the Hubbard model with infinitely large Coulomb repulsion and one hole (Nagaoka state) is unstable for a fullerene cluster if the hopping integral is negative, and possibly stable if possible. We analyze the stability versus the variation of the ratio between the hopping values for the two types of carbon-carbon bonds. The results suggest the existence of ferromagnetism in doped fullerene when the electronic correlation leads to a large effective electron-electron interaction.

• OSTI ID: 6691767
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

664500 -- Special Atoms & Molecules-- (1992-)
665400* -- Quantum Physics Aspects of Condensed Matter-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON
CHEMICAL BONDS
CORRELATIONS
CRYSTAL MODELS
ELECTRON CORRELATION
ELEMENTS
FERROMAGNETISM
FULLERENES
HUBBARD MODEL
MAGNETISM
MATHEMATICAL MODELS
NONMETALS
NUMERICAL SOLUTION
STABILITY